Table 4.

Weightings applied to morphometric variables of recently hatched shortnose sturgeon and Atlantic sturgeon exposed as embryos to graded doses of PCB126 and TCDD using principal component analysis^a

	Shortnose sturgeon			Atlantic sturgeon
	PC 1	PC 2	PC 3	PC 1	PC 2	PC 3
Variable	(49.7)	(17.6)	(9.9)	(46.9)	(18.3)	(11.7)
Total length	0.159	–0.110	0.332	0.199	0.014	0.065
Standard length	0.157	–0.118	0.334	0.201	0.003	0.060
Head size	0.128	0.053	–0.093	0.127	0.070	–0.363
Body length	0.156	–0.049	0.349	0.191	0.002	0.130
Yolk sac length	0.090	0.363	0.194	0.166	–0.051	0.320
Yolk length	0.110	0.313	0.083	0.146	–0.107	0.391
Yolk sac depth	–0.108	0.318	0.189	–0.037	0.486	0.189
Yolk depth	–0.102	0.342	0.201	–0.039	0.461	0.316
Eye size (pupil)	0.100	0.147	–0.524	0.126	0.224	–0.393
Eye size (iris)	0.138	0.092	–0.299
Eye development	0.143	0.081	–0.280	0.114	0.170	–0.393

^aThe principal component analysis scores computed with these weights were used subsequently in analysis of variance. Weights (eigenvectors) shown are for significant eigenvalues only (percentage of variance explained in parentheses). Variable definitions are listed in Table 1.

PCB126 = polychlorinated biphenyl 126; TCDD = 2,3,7,8-tetrachlorodibenzo-p-dioxin; PC = principal component.